Heater



W. DOBLE HEATER 2 Sheets- Sheet 1 Filed Aug. 1, 1921 INVENTOK Mm EN bour- WITNESS z ATTORNEYS W. DOBLE HEATER Filed Aug. 1, 1921 2 Sheets-Sheet 2 WITNESS INVENTOR d Z warren/@obw ill ATTORNEYS of the city and count 'on the line 2-2,

i oor 6. The fuel .em loy WAR-BEN" DOBI-E, 03 SAN FRANCISCO, GALIIOBNIA,

Q1500, CALIFORNIA, A GOORATION OF CALIFORNIA.

T031115, OF SAN I 7e ASSIGNOE '1'0 DOBLE a: Tm

Application filed August 1, 1921. Serial No. 489,087.

To all whom it me concern: 7

Be it, Lao t at I, WARREN Donna, a citizen of the United States, and a resident A of SanFrancmco and State of California, new and useful Heater, ing is a} specification.

of which the follow- The invention relates to a device for heat-- ing air. for the heating of homes, dwellings and other places of habitation.

An object of the invention is to provide a small heater having a large air heating capacity}:

Anot er object of the invention it to pro vide an inexpensive eificient air heater.

The invention possesses other advantageous features, some of which, with the foregoing, will be set forth at length in the following description where I shall outline in full that form of heater which I have selected for illustration in the drawings'accompanying and formin part of the present application. In said rawings, I-have shown one form of heater embodying my mvention, but it is to be understood that I do not limit myself to such form, since the invention as set forth in the claims, may be embodi in a plurality of forms.

Referring to said drawings:

Figure 1 is a vertical section of a heater embodying my invention.

Fig. 2 is a crosgi sectlon of the heater taken -Fig. 3 is a vertical section of a modified form of heater.

The heater of m inventioncomprises a burner, a highly e cient heat transferring structure, subjected on one side to the a r being heated and means for causing the a1r to flow rapidly over the surface of the heat transferring structure.

The heater shown in Fig. 1 comprises a circular metallic base 2, supported above the floor by suitable legs 3. The base is provided with a cylindrical combustion chamber 4 to which access may be had through the assage 5, which is normall closed y the in the heater and as t e gas burner is disthe combustion chamber, the

shown is gas, osed below perforated burner alate 7 forms the bottom the ipe as is admitted through of the chamber.

the conical hood 8.' and air under 9'an the air and gasare mixedinthe chamave invented a certain her 12, of which the perforated plate forms the top.

Resting on and concentric with the wall of the, combustion chamber is the unit 13 'of the heat transferring structure of which one or more may be employed. Each unitcomprises ahollow metallic cylinder, usually of cast iron, having a plurahty of thin, closely gpaced fins 14 sprlnging from its inner surace, and a plurality of thin closely spaced fins 15 springing from its outer surface. The fins are radially dis osed and the fins 14 are of difl'erent lengt s so that they divide the gas passage into a plurality of thin passages, thereby causing an efficiently transfer of the heat from the gases of combustion to the metal of the heat transferring structure.

The unit 13 is surrounded by a cylindrical shell 16 resting on the base and spaced slightly from the outer edges of the fins 15, forming an air passage 17 which is divided into a plurality of narrow passages by the fins 15. Resting on the upper end of the shell, is a spider 18 on which is disposed an electric motor19, the shaft of the motor being yertical and extending into the shell. A felt washer 21 is interposed between the motor and the spider to minimize vibration of the shell. Secured to the lower end of the motor shaft is a fan or propeller 22 which blows air downward through the air passage 17 and out through the hot air discharge conduit 23 at the bottom of the shell.

Arranged on the top of the upper heat transfer unit 13 is a cap 24 having a discharge passage 25 for the gases of combustion, passing through the unit 13. The as discharge passage is connected to a suita le flue for discharge into the atmosphere. The hot air outlet conduit may be connected to suitable distribution conduits which distribute the heated air to different parts of the house.

The heat of the gases of combustion is transferred from the'gases .to the fins 14 and conducted by the metal to the fins 15 from which it is transferred to the rapidly moving stream of air. The air and gases pass in opposite'directions, so that the gases of combustion v give up a very large proportion of their heat before they discharge from the heater. Since the air is forced through the heater under pressure, and is forced through the distributing conduits, the heater may be placed in any convenient location in the house.

In the construction shown in Fig. 3, airuuder pressure is introduced into the burner, creating a forced draft, which permits the combustion of a greater amount of fuel and causes a much hotter fire. This feature may be used in connection with the combustion of gaseous, liquid or solid fuel, and in the drawing I have shown it combined with a gas burner. The burner chamber 41 is disposed below the shell 16 as in the other constructions and the combustible mixture passes through the apertures 42 in the burner and is burned in the combustion chamber 4, as previously described. Fuel is introduced into the burner through the conduit 43 and the burner is connected to the interior of the shell at the bottom by the conduit 44, so that air under pressure produced by the fan or blower 22 and heated by contact with the fins 15, is forced into the burner chamber, producing a forced draft, and a very hot fire. The ar er portion of the hot air passes from the she I through the conduit 23 and only the desired amount for combustion enters the burner. The size of the fire is controlled by a valve 45 in the fuel conduit 43 and the quantity of air under pressure introduced into the burner is controlled by a butterfly valve 46 in the conduit 44. These valves .are preferably connected together by a link 4 so that the valves are movable concurrently, thereby maintaining the qualit of the combustible mixture while varymg t e size of the fire.

I claim:

1. An air heater, comprising a heat transferring structure, a burner arranged to discharge gases of combustion in contact with one side of said structure, means for blowing air in contact with the other side of said structure whereby the air is heated and a conduit for conveying a portion of said heated air to said burner.

2. An air heater, comprising a heat transferring structure, a burner arranged to dischage gases of combustion in contact with one side of said stucture, a shell surrounding said structure, a conduit connecting the burner with the space between the shell and the other side of said structure and means for forcing air under pressure into said space.

3. An air heater comprising a heat transferring structure, a burner arranged to dischar gases of combustion in contact with one side of said structure, means for passing air under pressure in contact with the other side of and structure, a fuel conduit connected to the burner and a conduit for said heated air under pressure burner.

4. j An air heater comprisinga heat transferring structure, a burner arranged to dischar e gases of combustion in contact with one side of said structure, means for passing air under pressure in contact with the other side of said structure, a fuel conduit connected to the burner, a conduit for said heated air under pressure connected to the burner, and a valve in said latter conduit.

5. An air heater comprising a heat transferring structure, a burner arranged to discharge gases of combustion in contact with one side of said structure, means for passing air under pressure in contact with the other side of said structure, a fuel conduit connected to the burner, a valve in the fuel conduit, a conduit for said heated air under pressure connected to the burner, a valve in said latter conduit and means operatively connecting said valves. 7

6. An air heater comprising a heat transferring structure a burner arranged to discharge gases of combustion in contact with one side of said structure, means for passing air under pressure in contact with the other side of saidstructure, a fuel conduit connected to the burner, a conduit for said heated air under pressure connected to the burner and means for simultaneously varying the flow of fuel and air through said conduits.

7 An air heater comprising a heat transferring structure, a burner arranged to disconnected to the charge gases of combustion in contact with one side of said structure, means for passing air under pressure in contact with the other side of said structure, a fuel conduit connected to the burner, a conduit for said heated air under pressure connected to the burn-' er and means for simultaneously varying the supplies of "air and fuel to the burner through said conduits.

8. An air heater comprising a hollow metallic heat transferring structure having a plurality of fins on its inner and outer surfaces, a burner arranged below the structureto discharge theproducts of combustion into the interior thereof, a shell surrounding said structure and forming therewith a passage in which the outer fins are disposed, a blower arranged to force air under pressure through said passage and a conduit connecting said passage with the burner.

In testimony whereof I have hereunto set my hand.

WARREN DOBLE. 

